ROBBO03 - MICROBEE FEATURES

- Native Z80 machine code for Premium 128K colour PCG / CP/M 2.2.
- All 60 DOS-edition planets, using decoded original level layouts.
- Original-derived sprite artwork, fitted to the full Microbee width.
- Ten-row vertical viewport; changed-tile rendering and cached PCG graphics.
- Bolts and exit capsules, boxes, keys, doors, ammo and four-way shooting.
- Bomb chains, surprises, sliding blocks, barriers and staged creation.
- Guards, patrolling bats, firing bats, eyes, guns, rotating/moving guns,
  lasers, blasters, teleports, magnets and extra-life objects.
- Premium arrow keys with held movement and simultaneous Space/direction.
- Standard PIO joystick: directions and fire, toggled by J.
- Five starting lives, restart with R, pause P, sound M, quit Q.
- Title-screen planet selection; Game Over waits for fresh input.
- Short native shoot, pickup, explosion, death and completion effects.
- ROBBO03.COM plus ROBBO03.DAT are both required on the same drive/user.
- No DOS music/voices, password screen or persistent progress saving.
- Original timing, random sequence and pixel scrolling are approximated.

See README.txt for controls, adaptation differences, tests and licenses.
Batched tile-plane writes retained from ROBBO02.
Hardware speed testing is still required.

ROBBO03: static-object logic bypass, cached static-tile lookup, incremental
HUD updates, video clock sampled per map row, two-tick timing ceiling.
